GTO-1001EZ - JBL Car Audio Service Manual (repair manual). Page 5

Use RCA audio cables to connect source units with preamp-level outputs to the amplifier; use the supplied bare wire-
to-RCA adapters to connect to source units that don’t have RCA output connectors.

Use a small Phillips screwdriver to loosen the adapter’s set screws and insert the speaker wires into the holes on the 
back of the adapter. Tighten the set screws to secure the wires. 

Always connect the (+) speaker wire to the (+) terminal on the adapter and the (–) speaker wire to the (–) terminal on 
the speaker.

IMPORTANT: Make sure the (+) and (–) bare wires do not touch each other. Touching wires can cause a short circuit 
that can damage the source unit or the amplifier.

When you’re finished, plug the adapter into the appropriate input connector on the amplifier. 

• You can use either input connector to connect a source component with a single mono subwoofer output.

The Bass Boost control provides up to 12dB of bass boost at 45Hz. Set this control according to your personal taste, 
but be careful not to set the control at a high enough level to cause audible distortion or bottoming of your subwoofer.

The GTO amplifier Power/Protection LED’s color indicates the amplifier’s operational status:

• LED is orange: Normal operation (power is on)

• LED is off: Amplifier is in standby mode

• LED is red: Amplifier is in protect mode

If the amplifier is in the protect mode (the LED is red), see Troubleshooting, on page 9.

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